Development of steady state adsorption distribution over interface of a bubble rising in solutions of n-alkanols (C5, C8) and n-alkyltrimethylammonium bromides (C8, C12, C16)

Krzan, Marcel; Zawała, Jan; Małysa, K.

doi:10.1016/j.colsurfa.2006.12.056

Cited by 71 publications

(62 citation statements)

References 33 publications

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“…With increasing solution concentration the position of the maximum on the local velocity profiles is shifted towards shorter distances, while its height and width are diminishing. Thus, influence of the BSA in solutions of pH = 5.8 was similar to that of typical surfactants (Sam et al 1996;Liao and McLaughlin 2000;Krzan and Malysa 2002;Krzan et al 2004Krzan et al , 2007Malysa et al 2005;. At the highest BSA concentration studied (c = 6 × 10 −7 M) the bubble terminal velocity of ca.…”

Section: Velocity Of the Rising Bubblesmentioning

confidence: 91%

“…Stroboscopic illumination of frequency 100 flashes per second was applied in measurements of the bubble local velocity as a function of distance from the capillary. Details of the set-up and measurement procedures have been described in details elsewhere (Krzan and Malysa 2002;Krzan et al 2004Krzan et al , 2007 Foam stability measurements were carried out using the set-up consisting of: a) cylinder glass column of inner diameter of 45 mm with a fritted glass at the bottom, b) syringe pump for supply fixed amount of gas into the solution. Prior the experiments column was carefully filled with 50 ml of the studied solution in such way that no foam was formed.…”

Section: Methodsmentioning

confidence: 99%

“…The maximum on the bubble local velocity profiles in surfactant solutions indicates, as showed in Krzan et al (2004Krzan et al ( , 2007 and Malysa et al (2005), that the steady-state (uneven) distribution of the surfactant coverage over the bubble surface (dynamic adsorption layer-DAL) has not been established there. Fact that this is also the case in the BSA solutions is proved by the bubble shape variations at different stages of the rising bubbles motion at BSA solution of concentration 6 × 10 −7 M and different pH showed in Figs.…”

Section: Velocity Of the Rising Bubblesmentioning

confidence: 95%

“…This gradient of the surface concentration reduces mobility of the bubble interface, due to surface tension gradients induced, and consequently the bubble velocity is lowered. This causes an increase of the hydrodynamic drag and the bubble velocity can be lowered even by over 50%, at adsorption coverage's assuring complete immobilization of the bubble surface fluidity (Krzan and Malysa 2002;Krzan et al 2004Krzan et al , 2007Malysa et al 2005;. It was reported by Ybert and di Meglio (1998) that also in BSA solutions of pH about 5.5 the velocity of the ascending bubbles was strongly reduced compared to the velocity in pure water.…”

Section: Introductionmentioning

confidence: 90%

“…Velocity of the bubbles rising in surfactant solutions is strongly slowed down (Levich 1962;Clift et al 1978;Sam et al 1996;Liao and McLaughlin 2000;Krzan and Malysa 2002;Krzan et al 2004Krzan et al , 2007 due to presence of the adsorption layer at their surfaces. Adsorption layer at the rising bubble surface retards fluidity of the gas/liquid interface and therefore the viscous drag exerted by continuous medium is increased (Levich 1962).…”

Section: Introductionmentioning

confidence: 97%

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Influence of pH of the BSA solutions on velocity of the rising bubbles and stability of the thin liquid films and foams

et al. 2010

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Influence of pH of the BSA solutions on velocity of the rising bubbles, stability of foams, and properties of single foam and wetting films was studied. It was found that the solution pH affected significantly the BSA surface activity and properties of the protein adsorption layer under dynamic and static conditions. At pH close to the isoelectric point (pH IEP = 4.8) the BSA showed the highest surface activity. The equilibrium microscopic foam films of thicknesses of 64-80 nm, depending on the BSA concentration, were obtained at pH = 5.8. Under dynamic conditions the bubble rising velocity was reduced in a highest degree and the foam formed were most stable at the solutions pH-5.8 and 4.8. Lowering the bubble velocity shows that the BSA adsorption layer was formed, which retarded fluidity of the bubble surface. When the solution pH was significantly lower (pH = 3.9) or much higher (pH = 10) than the pH IEP then the BSA practically had no influence on the bubble velocity and the foam stability was drastically reduced. Moreover, the pH variations affected also the time of the threephase contact (TPC) formation on mica surface covered by the BSA adsorption layers. These pH dependent changes in the BSA surface activity indicate that the BSA linear conformers, existing at pH far away from the pH IEP , have much higher affinity to aqueous phase resulting from higher net electrical charge present over the extended BSA molecule conformers.

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Section: Velocity Of the Rising Bubblesmentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Velocity Of the Rising Bubblesmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 97%

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Influence of pH of the BSA solutions on velocity of the rising bubbles and stability of the thin liquid films and foams

et al. 2010

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Quantitative characterization of bubble evolution in mineral oil for different air‐injection nozzles

Mao

Kang

Teng

et al. 2020

Asia-Pacific J Chem Eng

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The aim of the present study is to reveal characteristics of a rising bubble in quiescent mineral oil. Three air-injection nozzles with outlet diameters of 1.0, 2.0, and 3.0 mm were selected. Consecutively rising bubbles were produced as air was injected into mineral oil. Bubble visualization was implemented using the high-speed photography technique. Bubble images captured were processed using an in-house code to calculate the equivalent bubble diameter and the bubble velocity. The computational fluid dynamics technique was used to simulate flows around the rising bubble. The bubble trajectory, the bubble aspect ratio, and the bubble velocity were compared among the three nozzles. Correlations between nondimensional parameters were constructed. The results show that the bubble motion in mineral oil is stabilized in comparison with that in deionized water. Spherical and ellipsoidal shapes are prevalent.The bubble trajectory is rectilinear, which is independent of the nozzle outlet diameter. After the bubble separates from the nozzle, the equilibrium state is promptly attained. Smooth bubble evolution is ascribed to suppressed wake vortices immediately downstream of the bubble. Small nozzle outlet diameter is responsible for high aspect ratio but small Eötvös number. Values of the Weber number are much smaller than those associated with deionized water.The drag coefficient descends continuously with increasing Reynolds number (Re); the correspondence between the drag coefficient and Re is explicitly sensitive to the nozzle outlet diameter. K E Y W O R D Sbubble, bubble aspect ratio, bubble trajectory, drag coefficient, mineral oil, visualization

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Influence of Surface‐Modified Nanoparticles on the Hydrodynamics of Rising Bubbles

et al. 2021

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Local velocities of bubbles rising in four different nanosilica solutions were investigated experimentally. Also, the density, viscosity, and surface tension of fumed nanosilica and modified nanosilica solutions were measured. Heat treatment and chemical functionalization were used to modify the properties of silica nanoparticles. It was found that the addition of nanosilica affected the hydrodynamics of the rising bubble by increasing the drag friction at the interface. However, environmentally responsive nanosilica particles behaved like surfactant molecules, due to the interfacial activity of hydrophilic and hydrophobic chains. Silica nanoparticles coated with both hydrophilic and hydrophobic agents had a stronger effect on the interfacial properties than those coated only with the hydrophobic agent.

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Development of steady state adsorption distribution over interface of a bubble rising in solutions of n-alkanols (C5, C8) and n-alkyltrimethylammonium bromides (C8, C12, C16)

Cited by 71 publications

References 33 publications

Influence of pH of the BSA solutions on velocity of the rising bubbles and stability of the thin liquid films and foams

Influence of pH of the BSA solutions on velocity of the rising bubbles and stability of the thin liquid films and foams

Quantitative characterization of bubble evolution in mineral oil for different air‐injection nozzles

Influence of Surface‐Modified Nanoparticles on the Hydrodynamics of Rising Bubbles

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